Lincoln Electric INVERTEC V300-PRO SVM105-B Service Manual page 48

F-18
PROTECTION BOARD OUTPUT TEST(cont.)
TEST PROCEDURE
1. TURN POWER SWITCH OFF
2. Remove sheetmetal wraparound.
3. Perform Input Filter Capacitor Discharge procedure
detailed in Maintenance section
4. Remove the two through bolts that attach the
Power/Driver Board bracket to Protection/Input
Rectifier bracket. Each through bolt also supports a
resistor.
FIGURE F.4 — REMOVING THROUGH BOLTS & MOUNTING SCREWS
6. Remove the two screws attaching the Protection
Board/Input Rectifier bracket to main assembly
bracket.
TROUBLESHOOTING & REPAIR
V300-PRO
5. Slide the through bolts toward the Control Panel
until the brackets are disconnected and resistors are
loose. Be careful when loosening these through
bolts, as they secure the two resistors.
through bolts are removed, carefully place the resis-
tors and the connected wires to the side
7. Tilt the top of the Protection Board bracket toward
the Power Panel to gain access to test points on the
Protection Board.
F-18
As the